So, if you know the radius of the sphere, the velocity of the sphere, and the viscosity of the fluid, you can use Stokes’ law to figure out what the force resisting the sphere would be. Velocity also takes into account the gravity pulling the sphere down. This is a measurement of how fast the sphere is moving. F/ A× (u/h) / (u/h) N-s/m² Kinematic Viscosity : It is defined as the ratio of absolute. Dynamic (or Absolute) Viscosity: The dynamic viscosity () of a fluid is a measure of the resistance it offers to relative shearing motion. These two terms are related to fluids such as. Introduction Viscosity is a quantitative measure of a fluid’s resistance to flow. Rheology is a branch of physics or physical chemistry, while viscosity is a quantitative measurement that is useful in chemistry. For example, honey has a much higher viscosity than water. The key difference between rheology and viscosity is that rheology is the study of the flow of matter, whereas viscosity is a measure of its resistance to deformation. In simple terms, viscosity is a measurement of how “thick” a fluid is. Water will flow down the glass very rapidly whereas honey won’t.This is because honey is more viscous than water. Consider 2 glasses one filled with water and the other filled with honey. η (the Greek letter eta) is the viscosity of the fluid. Viscosity is the property of a fluid that resists the force tending to cause the fluid to flow. If 1g of potassium iodide is used to make up a total volume of 100ml, then a 1 w/v solution of potassium iodide has been made. This is used when a solid chemical is dissolved in a liquid. It can alternatively be abbreviated to m/v for mass per volume. or Viscosity of liquids Liquid viscosity data are important in many engineering applications in the petroleum refining and petrochemical industries. It is measured by dividing the tangential frictional force acting per unit. Viscosity (represented by the symbol ( eta) is the ratio of the shearing stress (F/A) to the velocity gradient (v x /z or dv x /dz) in a fluid or liquids. It is a measurement of the length from the center of the sphere to any point on its surface. Mass concentration of solution is expressed as w/v for weight per volume. Viscosity is the degree to which a fluid can resist its flow under an applied force. This is the force that is resisting the sphere’s motion and is trying to make it stop. From left to right, the variables in Stokes’ law are as follows: Stokes’ law applies this law of physics to spheres falling in fluids.Īccording to Stokes’ law, F=6πrηv. For example, pushing a spoon with a small force moves it easily through a bowl. In physics, this law is used to explain forces, those influences that cause objects to move or to slow down and eventually stop. Viscosity is an internal property of a fluid that offers resistance to flow. where etasp and eta 9 correspond to specific viscosity and relative viscosity, respectively, and c corresponds to the polymer concentration in g x dL.sup.-1. If you have studied physics even a little, you might be familiar with the well-known law that every reaction has an equal and opposite reaction. Stokes’ law is a law in physics that states that the force that resists a sphere’s fall in a viscous fluid is directly proportional to the velocity of the sphere, the radius of the sphere, and the viscosity of the fluid.
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